Cold rolled steels provide excellent press formability, surface finish, and thickness and flatness tolerances. Steel companies manufacture three groups of low- or ultra-low-carbon grades to meet a variety of customer formability requirements: CS Type B, DS Type B, EDDS, and EDDS+. They also produce HSLA steels and structural steel grades for those applications that require specified strength levels.
Cold rolled steels can also be specified as dent resistant or bake hardenable for applications that require dent resistance after forming and painting. Each grade can be processed with several surface finishes depending on customer requirements. Lubricants can be applied to enhance formability and to avoid at-press lubrication.
Cold rolled steels have the following features:
A dry film (acrylic/polymer) lubricant can also be supplied by further processing the cold rolled product through a coil coating facility. These specialty organic coatings are easily removed with a mild alkaline cleaner.
Tight control over chemical composition, hot rolling parameters, amount of cold reduction, annealing time and temperature, and the amount of temper rolling allow the production of high-quality cold rolled steel products to meet customers requirements. Commercial Steel (CS Type B) should be used for moderate forming or bending applications. CS Type B products are produced from aluminum-killed continuously cast slabs and, unless otherwise specified, have a carbon content of less than 0.15%.
To prevent the occurrence of fluting or stretcher strains during forming, CS products are tempered as a normal step in the mill processing.
For more severe forming applications, Drawing Steel Type B (DS Type B) should be used. DS Type B has a controlled carbon content (<0.06%) and is produced in such a manner that parts formed from DS Type B Steel should not exhibit stretcher strain.
Extra Deep Drawing Steel (EDDS) or Extra Deep Drawing Steel plus (EDDS+) should be used for the most demanding forming applications. These steels (also known as Interstitial Free or I-F steels) are produced from a vacuum degassed, titanium stabilized grade. EDDS and EDDS+ have the lowest carbon content available (<0,010%) and have been specially formulated to be most ductile products.
For high strength or structural applications, cold rolled steels are also available in yield strengths up to 50 ksi.
Cleaning should be followed by a pre-treatment prior to painting. Zinc or iron phosphates give good results on cold rolled steels. Mild abrasion prior to pre-treating may also be used to enhance mechanical bonding of the paint.
Cold rolled steels can be in general supplied as pre-painted or pre-primed.
Total Materia to wiodąca platforma informacji o materiałach, dostarczająca najobszerniejszych informacji o właściwościach materiałów metalicznych i niemetalicznych oraz innych danych dotyczących materiałów.
Wszystkie te informacje są dostępne w Total Materia Horizon, najlepszym narzędziu do doboru materiałów, zapewniającym niezrównany dostęp do ponad 540 000 materiałów, a także do wyselekcjonowanych i zaktualizowanych danych referencyjnych.
Total Materia Horizon obejmuje: